The Fermi Paradox (PDF)
$2
$2
https://schema.org/InStock
2
usd
Scientists estimate that there are over 100,000 intelligent alien civilizations in our galaxy alone—but we've never heard anything from any of them. Here are 13 possible explanations for why.
Size
1.6 MBLength
18 pages
- Size1.6 MB
- Length18 pages
Ratings
23
5.0
5 stars
100%
4 stars
0%
3 stars
0%
2 stars
0%
1 star
0%